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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.settings;
     18 
     19 import static com.android.settingslib.TetherUtil.TETHERING_INVALID;
     20 import static com.android.settingslib.TetherUtil.TETHERING_WIFI;
     21 import static com.android.settingslib.TetherUtil.TETHERING_USB;
     22 import static com.android.settingslib.TetherUtil.TETHERING_BLUETOOTH;
     23 
     24 import android.app.Activity;
     25 import android.app.Dialog;
     26 import android.bluetooth.BluetoothAdapter;
     27 import android.bluetooth.BluetoothPan;
     28 import android.bluetooth.BluetoothProfile;
     29 import android.content.BroadcastReceiver;
     30 import android.content.Context;
     31 import android.content.DialogInterface;
     32 import android.content.Intent;
     33 import android.content.IntentFilter;
     34 import android.content.pm.PackageManager;
     35 import android.hardware.usb.UsbManager;
     36 import android.net.ConnectivityManager;
     37 import android.net.wifi.WifiConfiguration;
     38 import android.net.wifi.WifiManager;
     39 import android.os.Bundle;
     40 import android.os.Environment;
     41 import android.os.UserHandle;
     42 import android.os.UserManager;
     43 import android.preference.Preference;
     44 import android.preference.PreferenceScreen;
     45 import android.preference.SwitchPreference;
     46 import android.widget.TextView;
     47 
     48 import com.android.internal.logging.MetricsLogger;
     49 import com.android.settings.wifi.WifiApDialog;
     50 import com.android.settings.wifi.WifiApEnabler;
     51 import com.android.settingslib.TetherUtil;
     52 
     53 import java.util.ArrayList;
     54 import java.util.concurrent.atomic.AtomicReference;
     55 
     56 /*
     57  * Displays preferences for Tethering.
     58  */
     59 public class TetherSettings extends SettingsPreferenceFragment
     60         implements DialogInterface.OnClickListener, Preference.OnPreferenceChangeListener {
     61     private static final String TAG = "TetherSettings";
     62 
     63     private static final String USB_TETHER_SETTINGS = "usb_tether_settings";
     64     private static final String ENABLE_WIFI_AP = "enable_wifi_ap";
     65     private static final String ENABLE_BLUETOOTH_TETHERING = "enable_bluetooth_tethering";
     66     private static final String TETHER_CHOICE = "TETHER_TYPE";
     67 
     68     private static final int DIALOG_AP_SETTINGS = 1;
     69 
     70     private SwitchPreference mUsbTether;
     71 
     72     private WifiApEnabler mWifiApEnabler;
     73     private SwitchPreference mEnableWifiAp;
     74 
     75     private SwitchPreference mBluetoothTether;
     76 
     77     private BroadcastReceiver mTetherChangeReceiver;
     78 
     79     private String[] mUsbRegexs;
     80 
     81     private String[] mWifiRegexs;
     82 
     83     private String[] mBluetoothRegexs;
     84     private AtomicReference<BluetoothPan> mBluetoothPan = new AtomicReference<BluetoothPan>();
     85 
     86     private static final String WIFI_AP_SSID_AND_SECURITY = "wifi_ap_ssid_and_security";
     87     private static final int CONFIG_SUBTEXT = R.string.wifi_tether_configure_subtext;
     88 
     89     private String[] mSecurityType;
     90     private Preference mCreateNetwork;
     91 
     92     private WifiApDialog mDialog;
     93     private WifiManager mWifiManager;
     94     private WifiConfiguration mWifiConfig = null;
     95     private UserManager mUm;
     96 
     97     private boolean mUsbConnected;
     98     private boolean mMassStorageActive;
     99 
    100     private boolean mBluetoothEnableForTether;
    101 
    102     /* One of INVALID, WIFI_TETHERING, USB_TETHERING or BLUETOOTH_TETHERING */
    103     private int mTetherChoice = TETHERING_INVALID;
    104 
    105     /* Stores the package name and the class name of the provisioning app */
    106     private String[] mProvisionApp;
    107     private static final int PROVISION_REQUEST = 0;
    108 
    109     private boolean mUnavailable;
    110 
    111     @Override
    112     protected int getMetricsCategory() {
    113         return MetricsLogger.TETHER;
    114     }
    115 
    116     @Override
    117     public void onCreate(Bundle icicle) {
    118         super.onCreate(icicle);
    119 
    120         if(icicle != null) {
    121             mTetherChoice = icicle.getInt(TETHER_CHOICE);
    122         }
    123         addPreferencesFromResource(R.xml.tether_prefs);
    124 
    125         mUm = (UserManager) getSystemService(Context.USER_SERVICE);
    126 
    127         if (mUm.hasUserRestriction(UserManager.DISALLOW_CONFIG_TETHERING)
    128                 || UserHandle.myUserId() != UserHandle.USER_OWNER) {
    129             mUnavailable = true;
    130             setPreferenceScreen(new PreferenceScreen(getActivity(), null));
    131             return;
    132         }
    133 
    134         final Activity activity = getActivity();
    135         BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
    136         if (adapter != null) {
    137             adapter.getProfileProxy(activity.getApplicationContext(), mProfileServiceListener,
    138                     BluetoothProfile.PAN);
    139         }
    140 
    141         mEnableWifiAp =
    142                 (SwitchPreference) findPreference(ENABLE_WIFI_AP);
    143         Preference wifiApSettings = findPreference(WIFI_AP_SSID_AND_SECURITY);
    144         mUsbTether = (SwitchPreference) findPreference(USB_TETHER_SETTINGS);
    145         mBluetoothTether = (SwitchPreference) findPreference(ENABLE_BLUETOOTH_TETHERING);
    146 
    147         ConnectivityManager cm =
    148                 (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    149 
    150         mUsbRegexs = cm.getTetherableUsbRegexs();
    151         mWifiRegexs = cm.getTetherableWifiRegexs();
    152         mBluetoothRegexs = cm.getTetherableBluetoothRegexs();
    153 
    154         final boolean usbAvailable = mUsbRegexs.length != 0;
    155         final boolean wifiAvailable = mWifiRegexs.length != 0;
    156         final boolean bluetoothAvailable = mBluetoothRegexs.length != 0;
    157 
    158         if (!usbAvailable || Utils.isMonkeyRunning()) {
    159             getPreferenceScreen().removePreference(mUsbTether);
    160         }
    161 
    162         if (wifiAvailable && !Utils.isMonkeyRunning()) {
    163             mWifiApEnabler = new WifiApEnabler(activity, mEnableWifiAp);
    164             initWifiTethering();
    165         } else {
    166             getPreferenceScreen().removePreference(mEnableWifiAp);
    167             getPreferenceScreen().removePreference(wifiApSettings);
    168         }
    169 
    170         if (!bluetoothAvailable) {
    171             getPreferenceScreen().removePreference(mBluetoothTether);
    172         } else {
    173             BluetoothPan pan = mBluetoothPan.get();
    174             if (pan != null && pan.isTetheringOn()) {
    175                 mBluetoothTether.setChecked(true);
    176             } else {
    177                 mBluetoothTether.setChecked(false);
    178             }
    179         }
    180 
    181         mProvisionApp = getResources().getStringArray(
    182                 com.android.internal.R.array.config_mobile_hotspot_provision_app);
    183     }
    184 
    185     @Override
    186     public void onSaveInstanceState(Bundle savedInstanceState) {
    187         savedInstanceState.putInt(TETHER_CHOICE, mTetherChoice);
    188         super.onSaveInstanceState(savedInstanceState);
    189     }
    190 
    191     private void initWifiTethering() {
    192         final Activity activity = getActivity();
    193         mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    194         mWifiConfig = mWifiManager.getWifiApConfiguration();
    195         mSecurityType = getResources().getStringArray(R.array.wifi_ap_security);
    196 
    197         mCreateNetwork = findPreference(WIFI_AP_SSID_AND_SECURITY);
    198 
    199         if (mWifiConfig == null) {
    200             final String s = activity.getString(
    201                     com.android.internal.R.string.wifi_tether_configure_ssid_default);
    202             mCreateNetwork.setSummary(String.format(activity.getString(CONFIG_SUBTEXT),
    203                     s, mSecurityType[WifiApDialog.OPEN_INDEX]));
    204         } else {
    205             int index = WifiApDialog.getSecurityTypeIndex(mWifiConfig);
    206             mCreateNetwork.setSummary(String.format(activity.getString(CONFIG_SUBTEXT),
    207                     mWifiConfig.SSID,
    208                     mSecurityType[index]));
    209         }
    210     }
    211 
    212     private BluetoothProfile.ServiceListener mProfileServiceListener =
    213         new BluetoothProfile.ServiceListener() {
    214         public void onServiceConnected(int profile, BluetoothProfile proxy) {
    215             mBluetoothPan.set((BluetoothPan) proxy);
    216         }
    217         public void onServiceDisconnected(int profile) {
    218             mBluetoothPan.set(null);
    219         }
    220     };
    221 
    222     @Override
    223     public Dialog onCreateDialog(int id) {
    224         if (id == DIALOG_AP_SETTINGS) {
    225             final Activity activity = getActivity();
    226             mDialog = new WifiApDialog(activity, this, mWifiConfig);
    227             return mDialog;
    228         }
    229 
    230         return null;
    231     }
    232 
    233     private class TetherChangeReceiver extends BroadcastReceiver {
    234         @Override
    235         public void onReceive(Context content, Intent intent) {
    236             String action = intent.getAction();
    237             if (action.equals(ConnectivityManager.ACTION_TETHER_STATE_CHANGED)) {
    238                 // TODO - this should understand the interface types
    239                 ArrayList<String> available = intent.getStringArrayListExtra(
    240                         ConnectivityManager.EXTRA_AVAILABLE_TETHER);
    241                 ArrayList<String> active = intent.getStringArrayListExtra(
    242                         ConnectivityManager.EXTRA_ACTIVE_TETHER);
    243                 ArrayList<String> errored = intent.getStringArrayListExtra(
    244                         ConnectivityManager.EXTRA_ERRORED_TETHER);
    245                 updateState(available.toArray(new String[available.size()]),
    246                         active.toArray(new String[active.size()]),
    247                         errored.toArray(new String[errored.size()]));
    248             } else if (action.equals(Intent.ACTION_MEDIA_SHARED)) {
    249                 mMassStorageActive = true;
    250                 updateState();
    251             } else if (action.equals(Intent.ACTION_MEDIA_UNSHARED)) {
    252                 mMassStorageActive = false;
    253                 updateState();
    254             } else if (action.equals(UsbManager.ACTION_USB_STATE)) {
    255                 mUsbConnected = intent.getBooleanExtra(UsbManager.USB_CONNECTED, false);
    256                 updateState();
    257             } else if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
    258                 if (mBluetoothEnableForTether) {
    259                     switch (intent
    260                             .getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR)) {
    261                         case BluetoothAdapter.STATE_ON:
    262                             BluetoothPan bluetoothPan = mBluetoothPan.get();
    263                             if (bluetoothPan != null) {
    264                                 bluetoothPan.setBluetoothTethering(true);
    265                                 mBluetoothEnableForTether = false;
    266                             }
    267                             break;
    268 
    269                         case BluetoothAdapter.STATE_OFF:
    270                         case BluetoothAdapter.ERROR:
    271                             mBluetoothEnableForTether = false;
    272                             break;
    273 
    274                         default:
    275                             // ignore transition states
    276                     }
    277                 }
    278                 updateState();
    279             }
    280         }
    281     }
    282 
    283     @Override
    284     public void onStart() {
    285         super.onStart();
    286 
    287         if (mUnavailable) {
    288             TextView emptyView = (TextView) getView().findViewById(android.R.id.empty);
    289             getListView().setEmptyView(emptyView);
    290             if (emptyView != null) {
    291                 emptyView.setText(R.string.tethering_settings_not_available);
    292             }
    293             return;
    294         }
    295 
    296         final Activity activity = getActivity();
    297 
    298         mMassStorageActive = Environment.MEDIA_SHARED.equals(Environment.getExternalStorageState());
    299         mTetherChangeReceiver = new TetherChangeReceiver();
    300         IntentFilter filter = new IntentFilter(ConnectivityManager.ACTION_TETHER_STATE_CHANGED);
    301         Intent intent = activity.registerReceiver(mTetherChangeReceiver, filter);
    302 
    303         filter = new IntentFilter();
    304         filter.addAction(UsbManager.ACTION_USB_STATE);
    305         activity.registerReceiver(mTetherChangeReceiver, filter);
    306 
    307         filter = new IntentFilter();
    308         filter.addAction(Intent.ACTION_MEDIA_SHARED);
    309         filter.addAction(Intent.ACTION_MEDIA_UNSHARED);
    310         filter.addDataScheme("file");
    311         activity.registerReceiver(mTetherChangeReceiver, filter);
    312 
    313         filter = new IntentFilter();
    314         filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
    315         activity.registerReceiver(mTetherChangeReceiver, filter);
    316 
    317         if (intent != null) mTetherChangeReceiver.onReceive(activity, intent);
    318         if (mWifiApEnabler != null) {
    319             mEnableWifiAp.setOnPreferenceChangeListener(this);
    320             mWifiApEnabler.resume();
    321         }
    322 
    323         updateState();
    324     }
    325 
    326     @Override
    327     public void onStop() {
    328         super.onStop();
    329 
    330         if (mUnavailable) {
    331             return;
    332         }
    333         getActivity().unregisterReceiver(mTetherChangeReceiver);
    334         mTetherChangeReceiver = null;
    335         if (mWifiApEnabler != null) {
    336             mEnableWifiAp.setOnPreferenceChangeListener(null);
    337             mWifiApEnabler.pause();
    338         }
    339     }
    340 
    341     private void updateState() {
    342         ConnectivityManager cm =
    343                 (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    344 
    345         String[] available = cm.getTetherableIfaces();
    346         String[] tethered = cm.getTetheredIfaces();
    347         String[] errored = cm.getTetheringErroredIfaces();
    348         updateState(available, tethered, errored);
    349     }
    350 
    351     private void updateState(String[] available, String[] tethered,
    352             String[] errored) {
    353         updateUsbState(available, tethered, errored);
    354         updateBluetoothState(available, tethered, errored);
    355     }
    356 
    357 
    358     private void updateUsbState(String[] available, String[] tethered,
    359             String[] errored) {
    360         ConnectivityManager cm =
    361                 (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    362         boolean usbAvailable = mUsbConnected && !mMassStorageActive;
    363         int usbError = ConnectivityManager.TETHER_ERROR_NO_ERROR;
    364         for (String s : available) {
    365             for (String regex : mUsbRegexs) {
    366                 if (s.matches(regex)) {
    367                     if (usbError == ConnectivityManager.TETHER_ERROR_NO_ERROR) {
    368                         usbError = cm.getLastTetherError(s);
    369                     }
    370                 }
    371             }
    372         }
    373         boolean usbTethered = false;
    374         for (String s : tethered) {
    375             for (String regex : mUsbRegexs) {
    376                 if (s.matches(regex)) usbTethered = true;
    377             }
    378         }
    379         boolean usbErrored = false;
    380         for (String s: errored) {
    381             for (String regex : mUsbRegexs) {
    382                 if (s.matches(regex)) usbErrored = true;
    383             }
    384         }
    385 
    386         if (usbTethered) {
    387             mUsbTether.setSummary(R.string.usb_tethering_active_subtext);
    388             mUsbTether.setEnabled(true);
    389             mUsbTether.setChecked(true);
    390         } else if (usbAvailable) {
    391             if (usbError == ConnectivityManager.TETHER_ERROR_NO_ERROR) {
    392                 mUsbTether.setSummary(R.string.usb_tethering_available_subtext);
    393             } else {
    394                 mUsbTether.setSummary(R.string.usb_tethering_errored_subtext);
    395             }
    396             mUsbTether.setEnabled(true);
    397             mUsbTether.setChecked(false);
    398         } else if (usbErrored) {
    399             mUsbTether.setSummary(R.string.usb_tethering_errored_subtext);
    400             mUsbTether.setEnabled(false);
    401             mUsbTether.setChecked(false);
    402         } else if (mMassStorageActive) {
    403             mUsbTether.setSummary(R.string.usb_tethering_storage_active_subtext);
    404             mUsbTether.setEnabled(false);
    405             mUsbTether.setChecked(false);
    406         } else {
    407             mUsbTether.setSummary(R.string.usb_tethering_unavailable_subtext);
    408             mUsbTether.setEnabled(false);
    409             mUsbTether.setChecked(false);
    410         }
    411     }
    412 
    413     private void updateBluetoothState(String[] available, String[] tethered,
    414             String[] errored) {
    415         boolean bluetoothErrored = false;
    416         for (String s: errored) {
    417             for (String regex : mBluetoothRegexs) {
    418                 if (s.matches(regex)) bluetoothErrored = true;
    419             }
    420         }
    421 
    422         BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
    423         if (adapter == null)
    424             return;
    425         int btState = adapter.getState();
    426         if (btState == BluetoothAdapter.STATE_TURNING_OFF) {
    427             mBluetoothTether.setEnabled(false);
    428             mBluetoothTether.setSummary(R.string.bluetooth_turning_off);
    429         } else if (btState == BluetoothAdapter.STATE_TURNING_ON) {
    430             mBluetoothTether.setEnabled(false);
    431             mBluetoothTether.setSummary(R.string.bluetooth_turning_on);
    432         } else {
    433             BluetoothPan bluetoothPan = mBluetoothPan.get();
    434             if (btState == BluetoothAdapter.STATE_ON && bluetoothPan != null &&
    435                     bluetoothPan.isTetheringOn()) {
    436                 mBluetoothTether.setChecked(true);
    437                 mBluetoothTether.setEnabled(true);
    438                 int bluetoothTethered = bluetoothPan.getConnectedDevices().size();
    439                 if (bluetoothTethered > 1) {
    440                     String summary = getString(
    441                             R.string.bluetooth_tethering_devices_connected_subtext,
    442                             bluetoothTethered);
    443                     mBluetoothTether.setSummary(summary);
    444                 } else if (bluetoothTethered == 1) {
    445                     mBluetoothTether.setSummary(
    446                             R.string.bluetooth_tethering_device_connected_subtext);
    447                 } else if (bluetoothErrored) {
    448                     mBluetoothTether.setSummary(R.string.bluetooth_tethering_errored_subtext);
    449                 } else {
    450                     mBluetoothTether.setSummary(R.string.bluetooth_tethering_available_subtext);
    451                 }
    452             } else {
    453                 mBluetoothTether.setEnabled(true);
    454                 mBluetoothTether.setChecked(false);
    455                 mBluetoothTether.setSummary(R.string.bluetooth_tethering_off_subtext);
    456             }
    457         }
    458     }
    459 
    460     public boolean onPreferenceChange(Preference preference, Object value) {
    461         boolean enable = (Boolean) value;
    462 
    463         if (enable) {
    464             startProvisioningIfNecessary(TETHERING_WIFI);
    465         } else {
    466             if (TetherUtil.isProvisioningNeeded(getActivity())) {
    467                 TetherService.cancelRecheckAlarmIfNecessary(getActivity(), TETHERING_WIFI);
    468             }
    469             mWifiApEnabler.setSoftapEnabled(false);
    470         }
    471         return false;
    472     }
    473 
    474     public static boolean isProvisioningNeededButUnavailable(Context context) {
    475         return (TetherUtil.isProvisioningNeeded(context)
    476                 && !isIntentAvailable(context));
    477     }
    478 
    479     private static boolean isIntentAvailable(Context context) {
    480         String[] provisionApp = context.getResources().getStringArray(
    481                 com.android.internal.R.array.config_mobile_hotspot_provision_app);
    482         final PackageManager packageManager = context.getPackageManager();
    483         Intent intent = new Intent(Intent.ACTION_MAIN);
    484         intent.setClassName(provisionApp[0], provisionApp[1]);
    485 
    486         return (packageManager.queryIntentActivities(intent,
    487                 PackageManager.MATCH_DEFAULT_ONLY).size() > 0);
    488     }
    489 
    490     private void startProvisioningIfNecessary(int choice) {
    491         mTetherChoice = choice;
    492         if (TetherUtil.isProvisioningNeeded(getActivity())) {
    493             Intent intent = new Intent(Intent.ACTION_MAIN);
    494             intent.setClassName(mProvisionApp[0], mProvisionApp[1]);
    495             intent.putExtra(TETHER_CHOICE, mTetherChoice);
    496             startActivityForResult(intent, PROVISION_REQUEST);
    497         } else {
    498             startTethering();
    499         }
    500     }
    501 
    502     public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    503         super.onActivityResult(requestCode, resultCode, intent);
    504         if (requestCode == PROVISION_REQUEST) {
    505             if (resultCode == Activity.RESULT_OK) {
    506                 TetherService.scheduleRecheckAlarm(getActivity(), mTetherChoice);
    507                 startTethering();
    508             } else {
    509                 //BT and USB need switch turned off on failure
    510                 //Wifi tethering is never turned on until afterwards
    511                 switch (mTetherChoice) {
    512                     case TETHERING_BLUETOOTH:
    513                         mBluetoothTether.setChecked(false);
    514                         break;
    515                     case TETHERING_USB:
    516                         mUsbTether.setChecked(false);
    517                         break;
    518                 }
    519                 mTetherChoice = TETHERING_INVALID;
    520             }
    521         }
    522     }
    523 
    524     private void startTethering() {
    525         switch (mTetherChoice) {
    526             case TETHERING_WIFI:
    527                 mWifiApEnabler.setSoftapEnabled(true);
    528                 break;
    529             case TETHERING_BLUETOOTH:
    530                 // turn on Bluetooth first
    531                 BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
    532                 if (adapter.getState() == BluetoothAdapter.STATE_OFF) {
    533                     mBluetoothEnableForTether = true;
    534                     adapter.enable();
    535                     mBluetoothTether.setSummary(R.string.bluetooth_turning_on);
    536                     mBluetoothTether.setEnabled(false);
    537                 } else {
    538                     BluetoothPan bluetoothPan = mBluetoothPan.get();
    539                     if (bluetoothPan != null) bluetoothPan.setBluetoothTethering(true);
    540                     mBluetoothTether.setSummary(R.string.bluetooth_tethering_available_subtext);
    541                 }
    542                 break;
    543             case TETHERING_USB:
    544                 setUsbTethering(true);
    545                 break;
    546             default:
    547                 //should not happen
    548                 break;
    549         }
    550     }
    551 
    552     private void setUsbTethering(boolean enabled) {
    553         ConnectivityManager cm =
    554             (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    555         mUsbTether.setChecked(false);
    556         if (cm.setUsbTethering(enabled) != ConnectivityManager.TETHER_ERROR_NO_ERROR) {
    557             mUsbTether.setSummary(R.string.usb_tethering_errored_subtext);
    558             return;
    559         }
    560         mUsbTether.setSummary("");
    561     }
    562 
    563     @Override
    564     public boolean onPreferenceTreeClick(PreferenceScreen screen, Preference preference) {
    565         ConnectivityManager cm =
    566                 (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    567 
    568         if (preference == mUsbTether) {
    569             boolean newState = mUsbTether.isChecked();
    570 
    571             if (newState) {
    572                 startProvisioningIfNecessary(TETHERING_USB);
    573             } else {
    574                 if (TetherUtil.isProvisioningNeeded(getActivity())) {
    575                     TetherService.cancelRecheckAlarmIfNecessary(getActivity(), TETHERING_USB);
    576                 }
    577                 setUsbTethering(newState);
    578             }
    579         } else if (preference == mBluetoothTether) {
    580             boolean bluetoothTetherState = mBluetoothTether.isChecked();
    581 
    582             if (bluetoothTetherState) {
    583                 startProvisioningIfNecessary(TETHERING_BLUETOOTH);
    584             } else {
    585                 if (TetherUtil.isProvisioningNeeded(getActivity())) {
    586                     TetherService.cancelRecheckAlarmIfNecessary(getActivity(), TETHERING_BLUETOOTH);
    587                 }
    588                 boolean errored = false;
    589 
    590                 String [] tethered = cm.getTetheredIfaces();
    591                 String bluetoothIface = findIface(tethered, mBluetoothRegexs);
    592                 if (bluetoothIface != null &&
    593                         cm.untether(bluetoothIface) != ConnectivityManager.TETHER_ERROR_NO_ERROR) {
    594                     errored = true;
    595                 }
    596 
    597                 BluetoothPan bluetoothPan = mBluetoothPan.get();
    598                 if (bluetoothPan != null) bluetoothPan.setBluetoothTethering(false);
    599                 if (errored) {
    600                     mBluetoothTether.setSummary(R.string.bluetooth_tethering_errored_subtext);
    601                 } else {
    602                     mBluetoothTether.setSummary(R.string.bluetooth_tethering_off_subtext);
    603                 }
    604             }
    605         } else if (preference == mCreateNetwork) {
    606             showDialog(DIALOG_AP_SETTINGS);
    607         }
    608 
    609         return super.onPreferenceTreeClick(screen, preference);
    610     }
    611 
    612     private static String findIface(String[] ifaces, String[] regexes) {
    613         for (String iface : ifaces) {
    614             for (String regex : regexes) {
    615                 if (iface.matches(regex)) {
    616                     return iface;
    617                 }
    618             }
    619         }
    620         return null;
    621     }
    622 
    623     public void onClick(DialogInterface dialogInterface, int button) {
    624         if (button == DialogInterface.BUTTON_POSITIVE) {
    625             mWifiConfig = mDialog.getConfig();
    626             if (mWifiConfig != null) {
    627                 /**
    628                  * if soft AP is stopped, bring up
    629                  * else restart with new config
    630                  * TODO: update config on a running access point when framework support is added
    631                  */
    632                 if (mWifiManager.getWifiApState() == WifiManager.WIFI_AP_STATE_ENABLED) {
    633                     mWifiManager.setWifiApEnabled(null, false);
    634                     mWifiManager.setWifiApEnabled(mWifiConfig, true);
    635                 } else {
    636                     mWifiManager.setWifiApConfiguration(mWifiConfig);
    637                 }
    638                 int index = WifiApDialog.getSecurityTypeIndex(mWifiConfig);
    639                 mCreateNetwork.setSummary(String.format(getActivity().getString(CONFIG_SUBTEXT),
    640                         mWifiConfig.SSID,
    641                         mSecurityType[index]));
    642             }
    643         }
    644     }
    645 
    646     @Override
    647     public int getHelpResource() {
    648         return R.string.help_url_tether;
    649     }
    650 }
    651